#include <sys/types.h>
  #include <sys/wait.h>
  #include <unistd.h>
  #include <stdio.h>
  #include <signal.h>
  #include <lclib.h>
  main()
  {
     int pipefds[2];
     pid_t pid;
     char *const parmList[] = {"/bin/ls", "-l", "/u/userid/dirname",
                               NULL };
     char lsout[200];           /* buffer for out ls output          */
     int amt;
     int status;                /* status code from ls               */
     fclose(stdout);            /* avoid stdio interfering with fd 1 */
     fclose(stdin);             /* avoid stdio interfering with fd 0 */
     close(STDOUT_FILENO);      /* make sure fd's 0 & 1 are avail    */
     close(STDIN_FILENO);
     pipe(pipefds);             /* create both ends of a pipe        */
     if (pipefds[0] == STDOUT_FILENO) {
        fprintf(stderr,
                "Warning: Input fileno is 1, should not occur.\n");
        pipefds[0] = dup(pipefds[0]);
        close(STDOUT_FILENO);
     }
     if (pipefds[1] != STDOUT_FILENO) {
        fprintf(stderr,
                "Warning: Output fileno is not 1, should not occur.\n");
        dup2(pipefds[1],STDOUT_FILENO);
                                /* make write end of pipe fd 1       */
        close(pipefds[1]);      /* close write end                   */
     }
     pid = oeattach("/bin/ls", parmList);
                                /* run ls command as subtask         */
     close(STDOUT_FILENO);      /* close write end of pipe in parent */
     for(;;) {                  /* read from the pipe                */
        amt = read(pipefds[0], lsout, sizeof(lsout));
        if (amt <= 0) break;
        fwrite(lsout, 1, amt, stderr);  /* write ls output to stderr */
     }
     wait(&status);             /* wait for ls to complete           */
     close(pipefds[0]);         /* close pipe input end              */
     if (WIFEXITED(status)) exit(WEXITSTATUS(status));
     else             /* if ls failed, use kill to fail the same way */
        kill(0, WTERMSIG(status));
  }